Nice work. The rich colors of the signs definitely give a nighttime-chiba city vibe, but there's a couple of things working against you. One is that the lightest value in the image is the pavement of the, which would indicate daytime, despite the bright colors of the lights and the cast shadows. Those shadows seem to indicate that the brightest light is coming from the stores on the right. This brings me to the second 'thing': your darkest solids are the ceilings and overhangs of the shops on the right. If those shops are producing all the light, then the ceiling of the first store should be reflecting a bunch of it. If it were one of the brighter parts of the drawing, I bet you'd get a much stronger 'nighttime' read. But these are small quibbles great job on the perspective, and in placing figures believably in it-- that's very difficult to do.

One last thing: please consider leaving a blank margin around the edge of your drawings and paintings. It will make them tons easier to mat, frame and scan. For the same reason I suggest placing your signature slightly higher, so that it wouldn't get cut off in those same situations.

Keep up the good work!